Make sha512-armv4.pl byte-order neutral.

[openssl.git] / crypto / sha / asm / sha512-armv4.pl

diff --git a/crypto/sha/asm/sha512-armv4.pl b/crypto/sha/asm/sha512-armv4.pl
index 7e7a726b17297bd61c7bfed26a262955ccb9e9bc..da720bd5d3228bf4bf8f130411d0c651cd31b199 100644 (file)
--- a/crypto/sha/asm/sha512-armv4.pl
+++ b/crypto/sha/asm/sha512-armv4.pl
@@ -12,12 +12,15 @@
 # This code is ~4.5 (four and a half) times faster than code generated
 # by gcc 3.4 and it spends ~72 clock cycles per byte. 
 
 # This code is ~4.5 (four and a half) times faster than code generated
 # by gcc 3.4 and it spends ~72 clock cycles per byte. 
 

-# This module currently has dependency on byte order, namely *dword*
-# order in ctx->h[0-9]. I have to think of a way to reliably detect
-# "endianness" [and flip below two constants] or arrange given dword
-# order in C.
-$lo=0; # this denotes little-endian platform.
-$hi=4;
+# Byte order [in]dependence. =========================================
+#
+# Caller is expected to maintain specific *dword* order in h[0-7],
+# namely with most significant dword at *lower* address, which is
+# reflected in below two parameters. *Byte* order within these dwords
+# in turn is whatever *native* byte order on current platform.
+$hi=0;
+$lo=4;
+# ====================================================================

 
 $ctx="r0";
 $inp="r1";
 
 $ctx="r0";
 $inp="r1";